In this study of star formation processes in the intergalactic medium of the interacting system NGC 5291, the authors present a multiwavelength view of the system, combining new observations and older ones in the archives.

This paper is a benchmarking study of ten independent codes used to model the structure of photon-dominated regions (PDRs). The impressive result is that it was possible to eliminate most (though not all) differences between the codes as one sees from this comparison of the pre- and post benchmarking results.

The authors provide stellar evolution models that convincingly demonstrate that so-called thermohaline mixing – a thermal timescale hydrodynamic instability first found in the earth oceans – provides a long sought mixing process beneath the convective envelopes in red giants, which brings the surface abundances of light elements into agreement with observations and avoids overproduction of 3He in the universe.

This paper presents a model for reconstructing the total solar irradiance since 1700, from surface magnetic flux data. This is a new step in our knowledge of long-term changes in the solar irradiation.